Two-latch lock with safety-catch.



PATENTED OCT. 24, 1905.

W. DTGKEL. TWO LATCH LOCK WITH SATETT GATGH.

AFPLIOATION YILBD APR: S.

TWOMILTCH LOCK lNlTi-l SAFE'l'Ym-CATCl-l.

Specification of Letters Patent.

atented Oct. 24, 1905.

Application filed April 3, 1905. Serial No. 253,660.

.To all wlmi/1t t nt/,ty/ concern:

Beit known that I, WILHELM DIoknL, a subject of the German Emperor, anda resident of Berlin, Germany, have invented certain new and usefulImprovements in Two-Latch Locks with Safety-Catch by Means of the Latch,of which the following is a specification.

The lock most in use for the doors of rooms and halls is the two-latchlock with a springbolt. In order to prevent that such a door could beopened from the other side, special devices werehitherto required,suchas anightbolt, a second lock, and the like. According to the presentinvention the lock is secured against being' opened by turning the latchin the direction the opposite of that in which it is opened, so that theopening of hall-doors by means of false keys can be easily prevented andwithout any special devices. To this end the roll-back of the lock isdivided perpendicularly to the axis of rotation, so that .each latch hasa roll-hack for itself, and the roll-back on the latch being turned inthe opposite direction fixes or secures the bolt of the lock.

The accompanying drawings show a form of construction of thelock withalatch on both sides.

Figure 1 shows the case of the lock 17 open. Fig. 2 shows the same in asection on the line mf fn, of Fig. l with the lower part omitted.

Similar numerals refer to similar parts throughout both views.

In the twolatch locks with a spring-bolt hitherto in use the latch couldbe turned only in one directiondfor instance the latch 6 of Fig. 1downward, whereby its thumb 2 gets into the position indicated by adotted line and thereby pushes back the bolt 7 of the lock, and thuslopens the door. lf now, as done in this invention, the latch 6 isturned upward into the position 5, its thumb 2 gets into the position 1and sets against a projection 18 of the bolt, so that the latter cannotbe moved from the other side of the door. The super-posed parts andaofthe roll-hack have, as shown in Fig. 2, a mutual inner guide. They areheld together at their contact-surface by a ring 12, which might,however, also be fastened to one of the roll-backs.

In order to fasten the pin 8 or 9 of the latch 6 or 5 in its roll-back 3or 11, it is split longitudinally, and the end of it is excavated, asshown in Fig. 2. This cavity tapers toward the interior, while the holeof the rollv back tapers toward the outside. 1n the cavity is a splitpiece 10 or 11 on a pin 18 or 19, which pin passes through the latch 6or 5 and is threaded at the end. lf the roll-back 20 is drawn tight, theparts of the pin 8 or 9 cleave or fork asunder and the latch 6 or 5 isfirmly secured in its roll-back 3 or et.

It is immaterial whether both door-latches are fixed or are in the formof keys or whether a fixed latch and a key are used.

F or hall-doors only a fixed latch is used, as a rule, while the door isopened from the outside by means of a key. Such a door is safely lockedfrom the inside in the above-described manner. If the door is also to besecured from the outside, a second lock 22,with key 23, is used, thebolt 21 of which secures the bolt 7. 1n order to be able after releasing the safety device to open the door with the same key .Q3-that is tosay, to push back the bolt (#there is either provided on the holt 'T aprojection matchingthe key 23, or, as shown in Fig. 1, a lever 24C isused. 1f now the key Q3 is turned in the opposite direction, it turnsthe lever 24:, and the latter pushes back the bolt 7 by means of theprojection 1a.

In order to su pport the latch 6 or 5 in its horizontal position, aspringy projection 15 has been provided, against which sets the thumb 16of the roll-hack 3.

If the door is to be secured on one side only, a projection 25 isprovided, which prevents the roll-back from being' turned in theopposite direction and into the position 1.

Vhat l claim as my invention, and desire to secure by United StatesLetters Patent, is-

l. 1n a two-latch lock with a spring-bolt and a roll-back the divisionof this roll-back vertical to its axis, and the device by which, inconsequence of turning the latch in the opposite direction (direction ofthe arrow,) the bolt of the lock is secured in its closing position, sothat the door is at once protected against being opened from theoutside, substantially as set forth.

2. In a two-latch lock with a spring-bolt and a roll-back thearrangement that the pin of the latch (8 or 9) is split and that thereis pressed into its wedge-like excavated end a splitting-piece (10 or11,) which is placed on a pin 18 or 19 extending through the latch andwhich is drawn 'tight from the outside, substantially as set forth.

3. In a two-latch lock with a spring-bolt and a roll-back thearrangement of a second lock 22 serving to bolt the lock of the door,and the key 23 of which, if turned in the opposite IOO IIO

direction, also opens it, substantially as set In Witness whereof l havehereunto signed foi-th. my name, this 15th day of March, 1905, in 4. InetWo-latoh lockwith aspring-loolt and the presence of two subscribingWitnesses. a rollback a projection 25 which prevents one VVILHELNIDICKEL. 5 part of the roll-back from being turned into VitneSses:

the locking position l, substantially as and for HENRY HASPER,

the purpose set forth. WOLDEMAR HAUPT.

